Xcode 9.2 UIDocumentBrowserViewController:无法从bookmarkableString创建URL

Question

更新:Xcode 9.3修复了它.

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在中创建UIDocument文件时 UIDocumentBrowserViewController

[默认] [错误]无法解析书签.错误:错误域= NSFileProviderInternalErrorDomain代码= 1"不允许读者访问该URL." UserInfo = {NSLocalizedDescription =不允许读者访问该URL.}

[DocumentManager]无法从bookmarkableString创建URL(错误域= NSFileProviderInternalErrorDomain Code = 1"不允许读者访问URL."UserInfo = {NSLocalizedDescription =不允许读者访问URL.})

代码在Xcode 9.1中运行良好,但在Xcode 9.2中失败.与wwdc 2017几乎相同的代码.

func documentBrowser(_ controller: UIDocumentBrowserViewController, didRequestDocumentCreationWithHandler importHandler: @escaping (URL?, UIDocumentBrowserViewController.ImportMode) -> Void) {
    let newDocumentURL: URL? = R.file.templateDocument()

    // Set the URL for the new document here. Optionally, you can present a template chooser before calling the importHandler.
    // Make sure the importHandler is always called, even if the user cancels the creation request.

    if newDocumentURL != nil {
        importHandler(newDocumentURL, .copy)
    } else {
        importHandler(nil, .none)
    }
}